Tendonitis is the inflammation of a tendon which results in varying levels of pain and discomfort, even at rest. This is the body's natural response to injury or overuse. Achilles Tendonitis most commonly occurs among athletes who are training under less than ideal conditions (hard surfaces, tired footwear, sudden increase in activity levels) when running, lunging and/or jumping. Early intervention to reduce the stress on the tendon is essential as the tendon itself does not have good blood supply and natural recovery otherwise takes time and involves rest.